Communication terminal, fixed-line phone, and computer readable medium

A communication terminal includes a communication interface configured to exchange data via a communication network, a memory, a first table stored in the memory and configured to store identifiers of communication terminals which are senders of received data, a second table stored in the memory and configured to store identifiers of communication terminals designated by a user, a user interface configured to receive an input of an identifier of a communication terminal with which a communication is to be initiated, and a processor configured to determine whether the identifier of the communication terminal input via the user interface is stored in the first table, determine whether the input identifier of the communication terminal is stored in the second table, and if a result of the determination is affirmative, instruct the communication network not to notify an identifier of its own terminal to the communication terminal.